Die for metal-drawing machines.



N0. 678,789. Patented July I6, I90].

' W. A. MCCOUL.

DIE FOB METAL DRAWING MACHINES.

(Appiication filed Nov. 14, 1896.)

(No Model.)

llharirnn Srnrns Arnrvr rrrcn.

WILLIAM A. MOOOOL, OF BEAVERFALLS,

PENNSYLVANIA, ASSIGNOR, BY

LAND, OHIO.

DIE FOR ETAL DRAWING MACHINES.

SPECIFICATION formingpart of Letters Patent No. 678,789, dated July 16, 1901. Application filed November 14, 1896. Serial No. 612,059. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM A. MoCooL, a citizen of the United States, residing at Beaverfalls, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Dies for Metal-Drawing Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will onable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figure 1 is a longitudinal section showing a portion of a drawing-bench sufficient to illustrate the manner of applying my improved die. Fig. 2 is a face view of the die and of the carrier which supports it. Fig. 3 a transverse section through the die and carrier. Figs. 4 and 5 are longitudinal sectional views of the die-carrier and die, respectively.

2 5 The present invention relates to an improvement in dies of the class used in cold-drawing cylindrical metal articles, such as shafts, rods, and tubing. Aslis well known, the art of drawing these articles cold requires the use of dies, through which the shafts or tubes are drawn, there generally being a number of passes required in order to reduce the metal to the desired diameter and each die being of an interior diameter very slightly less than the one preceding it in the series. The dies become rapidly worn and impaired and heretofore the impairing of the die in this way has thrown it out of use until it was re-dressed, and in order to keep the machines in operation others had to be in readiness, and consequently a large number of the dies had to be kept on hand.

One of the objects of the present invention is to produce a die and die-carrier of novel construction, whereby upon the die becoming worn it may be reversed and used again before it is necessary to re-dress it in a lathe or otherwise.

In the drawings, A indicates a part of the 0 main framing of a drawing-bench, there being guides at B for the sliding parts. In the guides are mounted the pushing-carrier O and the drawing-carrier 0, one on one side and the other on the other side of the die. These carriers are actuated by means of a cable D,engaging with a power-driving mechanism at E, the cable passing over guidewheels d, one at each end of the bench.

It is unnecessary to illustrate or describe herein in detail all of the parts of the drawing-bench, first, because I have shown and described them in full in another application for patent heretofore filed-to wit, Serial N 0. 605,657, filed September 12, 1896-and, secondly, because the invention to which this application more particularly pertains can be applied to any of many of the now wellknown forms of drawing-machines.

In the present drawings there is a conventional showing of a mandrel and its stem at F and a tube at F, which is being subjected to the action of the drawing-bench;'but it will be understood that the parts characterizing the present improvements can be also used in drawing solid rods or shafting.

The external die is indicated as a whole by G, and its support or carrier by H. Heretofore it has been generally customary to form this carrier H with a conical cavity tapering inward from the side from which the rod or tube is received and to insert into this cavity a die having an external tapered surface narrowtube. I, on the contrary, form a cylindrical cavity at 72, and a shoulder or flange at b and shape the die G externally, so that it shall be cylindrical and neatly fit Within the cavity at h and abut against the shoulder at if.

The die is formed with two conicalor flaring oppositely-extended mouths g 9 meeting at the circle of smallest diameter g which is preferably at about the center longitudinally of the die.

terparts of each other.

As the die is externally cylindrical instead of tapering, it does not have the same tendency to be held frictionally tight in the cavity in the carrier H that is incident to the earlier constructions. To permit of its being gripped 1 as tightly as necessary, however, by or against Ioo ing in the direction of travel of the shaft or The two flarin months are coun the walls of the cavity, I form small slots h h in the metal of the carrier H and communicating with the socket or cavity and perforate the carrier with transverse bolt-apertures and insert in the latter bolts, as at I 1.

After a die has been put in place the bolts I are turned and the Walls of the carrier-cavity are drawn together sufficiently to firmly grip the die.

The manner of using my improved die will be readily understood from the drawings and the above description. After both of the flaring months have been properly dressed the die is inserted into the carrier and clamped by the bolts I. drawn through it, its action being to slightly compress the same, and this is continued until it is found that the surface of the tapered month has become marred. After this occurs the operator can very quickly loosen the bolts 1, release the die, and reverse it, thus virtually providing a new die and continuing the operation without the loss of time. When both of the mouths have become marred, the

die can be re-dressed at the lathe by practically a single operation. Consequently a large amount of time is saved, both at the drawing-bench and at the machines where the dies are prepared.

What I claim is 1. In a mechanism for drawing shafting or tubing, the combination of a holder or carrier having a cylindrical socket or cavity, a reversibledie having an eXteriorly-cylindrical body adapted to fit the said cavity in the holder, and "having two oppositely-flaring mouths, and supplemental means engaging with the holder for securing said die in position therein, substantially as set forth.

2. In a mechanism for drawing shafting or tubing, the combination with a die-holder having a cavity or socket, h, opening through opposite walls and slots, 7L formed in its body on opposite sides of and communicating with said cavity, of a die adapted to fit within the Shafting or tubing is then' craves socket or cavity in said holder, and supplemental devices for drawing the walls of said slots, 7L3, closer together, substantially as set forth.

3. In a mechanism for drawing tubes or shafting, the combination of a die-holder having a cavity or socket, h, formed therein and having a slot formed in a wall ofthe cavity, an abutment, 713, at one end of said cavity, of a die having a body conforming to the shape of the cavity in the holderand provided with two oppositely-flaring mouths, and supplemental means for compressing the separated portions of said slotted wall of the socket in the holder upon said die, substantially as set forth.

4:. In a draw-bench, the combination of a die-holder supported to extend transversely of the bench and having a socket or passage formed therein and opening through the front and rear walls thereof, the side walls of said socket having one or more slots opening therethrough, as at 71- a die adapted to be seated within said socket in the holder, and lockingbolts, 1, extending through the holder and across the slots h substantially as and for the purpose set forth.

5. In a draw-bench, the combination of a die-holder arranged to extend transversely of the bench and having a socket or passage opening through the opposite end faces thereof, one end of said passage being partially closed by an abutment 71/2, and the sides or walls of said socket having, at opposite points slots h opening therethrough, and means for drawin g the walls of the last said slots, h together, whereby a die can be securely held within the holder, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM A. MCCOOL.

Witnesses:

HARRY W. REEVES, HUNTER ERKUT. 

